Wemoto have increased their range of parts for BMW's. I tend to get my Hiflo oil & air filters from them.
They also do the alternator drive belt, https://www.wemoto.com/bike/bmw/r/1200/ ... drive-belt which is cheaper than Motorworks, https://www.motorworks.co.uk/catalogsea ... 1318528385
I like the one stop shop, get parts for the Yamaha XJ650 too.
Think I'll put an order in for the next service items on both motorcycles.